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本文设计了两种具有微结构纤芯的光子晶体光纤(PCFs)——矩形芯和椭圆芯PCFs,利用电磁场散射的多极理论研究了这两种光纤的基本特性.发现在光纤包层气孔不变的情况下,仅通过调节纤芯气孔的大小就可以灵活地调节光纤的双折射、色散和非线性特性.随着纤芯气孔半径r1的增大,两种纤芯结构的PCFs表现出如下特点:双折射度增大且最大双折射度对应的波长发生红移,零色散波长由一个增加到三个,短波段非线性系数增大而长波段非线性系数减小.r1=0.4μm的椭圆芯PCFs的三个零色散波长分别位于可见、近红外和中红外波段.在结构参数相似的情况下,椭圆芯PCFs比矩形芯PCFs更容易实现高双折射和高非线性.
In this paper, two kinds of PCFs (PCFs), rectangular cores and elliptical core PCFs, with microstructured core are designed. The basic characteristics of these two kinds of fibers are studied by the multipole theory of electromagnetic field scattering. Variable, the birefringence, dispersion and nonlinearity of the fiber can be flexibly adjusted only by adjusting the size of the core pores. As the core pore radius r1 increases, the PCFs of the two core structures show the following Features: Birefringence increases and the maximum birefringence corresponds to the wavelength of redshift, the zero dispersion wavelength increases from one to three, the nonlinear coefficient of short band increases and the nonlinear coefficient of long band decreases .r1 = 0.4μm The three zero-dispersion wavelengths of the elliptical core PCFs are in the visible, near-infrared and mid-infrared bands, respectively, and the elliptical core PCFs can achieve high birefringence and high nonlinearity more easily than the rectangular core PCFs under similar structural parameters.